CN201229093Y - Air-cooled heat exchanger for air conditioner with liquid division structure - Google Patents

Abstract

An air-cooled heat exchanger for air conditioning with a liquid separation structure. The heat exchanger includes an upper header, a lower header, and heat exchange tubes arranged in parallel and vertically between the upper and lower headers. The fins on the heat exchange tube and the liquid separation structure arranged on one side of the heat exchanger, the liquid separation structure is composed of a liquid distribution pipe arranged vertically and an inlet and outlet pipe arranged at the bottom of the liquid distribution pipe. The part of the tube that penetrates into the dispensing tube consists of a horizontal section and a vertical section. The utility model can realize automatic separation of refrigerant gas-liquid two-phase, thereby solving the problem of uneven flow of gas-liquid two-phase refrigerant in each channel when the heat exchanger is used as an evaporator, and has the characteristics of simple structure and good shunting characteristics. It can be used in air-cooled evaporators, air-cooled condensers or other two-phase fluid air-cooled heat exchangers of air-conditioning devices or systems.

Description

Air-cooled heat exchanger for air conditioner with liquid separation structure

technical field

The utility model relates to an air-cooled heat exchanger for air conditioners with a self-contained liquid separation structure, which is used in household air conditioners, commercial air conditioners or other occasions requiring air-cooled heat exchangers, and belongs to the technical field of air-conditioning equipment.

Background technique

In the refrigeration and air conditioning system, the refrigerant entering the evaporator is a gas-liquid two-phase mixture, which is usually divided into multiple channels to enter the evaporator to absorb heat, and the liquid phase evaporates into gas to achieve the purpose of refrigeration and air conditioning. Whether the refrigerant two-phase fluid, especially the liquid in it, can be evenly distributed to each channel for heat exchange is the key to the design and structure of the evaporator. In actual operation, due to the change of working conditions or the unreasonable design of the liquid separator, when the liquid distribution of each channel is uneven, it will lead to uneven refrigerant flow in different pipes, and some pipes have less flow and evaporate to dryness prematurely. There is too much superheat at the outlet of the pipeline; while some pipelines have too much flow, the outlet causes too little superheat, and even contains part of the liquid; both of which make the heat exchange area of the evaporator not fully utilized, thus Seriously impact system performance.

In addition, when the refrigerant entering each channel of the evaporator is a gas-liquid mixture, the volume of the gas part is large, occupying a large heat exchange space and area of the evaporator, resulting in a decrease in the heat exchange efficiency of the evaporator, large volume, and high cost. improve.

Utility model content

Aiming at the deficiencies and defects of the prior art, the purpose of this utility model is to provide an air-cooled heat exchanger for air conditioning with its own liquid separation structure, so as to solve the problem of uneven flow of refrigerant in each channel in the evaporator and cause heat exchange. The area is not fully utilized, and the refrigerant gas entering the evaporator wastes the heat exchange area, and the heat exchange effect is improved, so that it has the characteristics of low cost, simple structure, and high heat exchange efficiency.

The purpose of this utility model is achieved through the following technical solutions:

An air-cooled heat exchanger for air conditioning with a self-contained liquid separation structure, the heat exchanger includes an upper header 1, a lower header 4, and heat exchange tubes 2 arranged in parallel and vertically between the upper and lower headers, The fins 3 worn or welded on the heat exchange tube are characterized in that a liquid separation structure is provided on one side of the heat exchanger, and the liquid separation structure is composed of a liquid separation pipe 6 arranged vertically and arranged on the The inlet and outlet pipe 5 at the bottom of the liquid distribution pipe is composed of the upper part of the liquid distribution pipe connected with the upper header through the communication pipe 8, and the lower part is connected with the lower header; the part of the inlet and outlet pipe 5 that penetrates into the liquid distribution pipe Consists of horizontal and vertical segments.

The technical feature of the utility model is that: when the heat exchanger is used as an evaporator, the heat exchange tube 2 goes deep into the bottom of the lower header 4 . When the heat exchanger is used as a condenser, a one-way valve 7 is arranged on the connecting pipe 8, and an oil return hole 10 is opened on the horizontal section inside the liquid separating pipe.

In the above technical solution, the heat exchange tubes may adopt single-pass flow or multi-pass flow single-pass tubes, or micro-scale multi-channel tubes with single-pass flow or multi-pass flow.

The utility model also provides a second type of air-cooled heat exchanger for air conditioning with its own liquid separation structure. The heat exchanger includes an upper header 1, heat exchange tubes 2 arranged in parallel and horizontally, and a distributor at the refrigerant inlet. 9 and the fins 3 worn or welded on the heat exchange tubes are characterized in that: a liquid distribution pipe 6 is vertically arranged on one side of the distributor, and the upper part of the liquid distribution pipe connects with the upper collector through a communication pipe 8 The pipe is connected, and the lower part is connected with the distributor; the bottom of the liquid distribution pipe is provided with an inlet and outlet pipe 5, and the part of the inlet and outlet pipe that goes deep into the liquid distribution pipe is composed of a horizontal section and a vertical section.

For the second technical solution of the utility model, it is also characterized in that: when the heat exchanger is used as a condenser, a one-way valve 7 is set on the connecting pipe 8, and a valve is opened on the horizontal section inside the liquid separating pipe. An oil return hole 10. The heat exchange tube adopts a single tube with single-pass flow or multi-pass flow. The heat exchange tube adopts a micro-scale multi-channel tube with one-pass flow or multi-pass flow.

Compared with the prior art, the utility model has the following advantages and outstanding effects: ① The utility model effectively solves the problem of uniform distribution of the gas-liquid mixture of the refrigerant in the evaporator, especially when the evaporator has many branches such as When the micro-channel aluminum strip tube is used, the problems of waste of heat exchange area of the evaporator and decrease of heat exchange efficiency caused by uneven liquid separation are avoided. Moreover, the liquid separation structure involved in the utility model makes the refrigerant entering the evaporator only liquid, which effectively solves the problem that the gas enters the evaporator and occupies the heat exchange area, making the evaporator bulky, and it is expected to reduce the cost of the evaporator or reduce the cost of the evaporator at the same time. The heat transfer performance is significantly improved when the heat transfer area is reduced. ② When the refrigerant flows in the opposite direction, the heat exchanger can be used as a condenser, which effectively solves the problem of liquid separation when the heat exchanger switches between the evaporator and the condenser in the heat pump air conditioner. ③ The involved liquid separation structure is simple, reliable, and low in cost. ④ The involved liquid separation structure can also be used in conventional finned tube air conditioner heat exchangers in which heat exchange tubes are arranged horizontally.

Description of drawings

Fig. 1 is an air-cooled heat exchanger for an air conditioner with a vertical arrangement of the main body provided by the utility model and its own liquid separation structure.

Fig. 2 is an air-cooled heat exchanger for air-conditioning with a liquid separation structure provided by the utility model with a main body arranged horizontally.

Figure 3 is a schematic diagram of the liquid separation structure.

Fig. 4 is a schematic diagram of a heat exchange tube with multi-pass flow.

Detailed ways

Below in conjunction with accompanying drawing, structure and working principle of the present utility model are further described.

Fig. 1 is an air-cooled heat exchanger for an air conditioner with a vertical arrangement of the main body provided by the utility model and its own liquid separation structure. The heat exchanger includes an upper header 1 , a lower header 4 , heat exchange tubes 2 arranged parallel and vertically between the upper and lower headers, and fins 3 pierced or welded on the heat exchange tubes. A liquid separation structure is provided on one side of the heat exchanger, and the liquid separation structure is composed of a liquid separation pipe 6 arranged vertically and an inlet and outlet pipe 5 arranged at the bottom of the liquid separation pipe. The upper part of the liquid distribution pipe 6 communicates with the upper header 1 through the communication pipe 8, and the lower part communicates with the lower header; the part of the inlet and outlet pipe 5 that penetrates into the liquid distribution pipe 6 is composed of a horizontal section and a vertical section. composition.

When the heat exchanger is used as an evaporator, the heat exchange tube 2 will go deep into the bottom of the lower header 4 . When the heat exchanger is used as a condenser, a one-way valve 7 is arranged on the connecting pipe 8, and an oil return hole 10 is opened on the horizontal section inside the liquid separating pipe. The heat exchange tube adopts a single tube with one-pass flow or multi-pass flow, or a micro-scale multi-channel tube with one-pass flow or multi-pass flow.

When the main part of the heat exchanger is arranged vertically and used as an evaporator, the gas-liquid two-phase refrigerant from the throttling device first enters the liquid distribution pipe 6 through the inlet and outlet pipe 5 in the direction of the solid arrow in the figure, and the force of gravity The liquid in the liquid pipe 6 flows downward, and the gas flows upward, so that the upper part of the liquid pipe 6 is gas and the lower part is liquid, and the purpose of liquid separation of the gas-liquid two-phase refrigerant is achieved. The gas in the upper part directly enters the upper header 1 through the connecting pipe 8, the liquid in the lower part enters the lower header 4 which is connected to the lower part of the liquid distribution pipe 6, and the liquid enters the heat exchange tube 2 in the lower header to exchange heat and becomes gas and enters the upper header 1. In the upper header, it is combined with the gas entering the upper header through the connecting pipe 8 and then discharged from the upper header. Due to the existence of the connecting pipe, the refrigerant entering the lower header 1 is all liquid, and the inlet of the heat exchange tube 2 goes deep into the bottom of the lower header, which can ensure that the refrigerant entering each heat exchange tube is all liquid. Thereby, uniform liquid distribution is realized, and the refrigerant gas entering the liquid distribution pipe 6 is avoided from wasting the heat exchange area of the evaporator. The problem of uneven flow of refrigerant in various pipes in the evaporator is solved, so that the heat exchange area is effectively utilized and the heat exchange effect is improved.

When the main part of the heat exchanger is arranged vertically and used as a condenser, the high-temperature and high-pressure gas from the compressor first enters the upper header 1 in the direction reversed by the dotted arrow in Fig. After the heat is released in the heat pipe 2, it becomes a liquid and enters the lower header 4, and finally is discharged from the heat exchanger through the inlet and outlet pipe 5 in the liquid distribution pipe 6 communicated with the lower header (dashed arrow in Figure 1). A one-way valve 7 is provided on the communication pipe 8, which only allows the gas to flow from the liquid distribution pipe 6 to the upper header 1 through the communication pipe 8, and does not allow the refrigerant gas to flow from the upper header to the upper header through the communication pipe 8. The flow of the lower header 4 avoids the short circuit phenomenon that the refrigerant gas directly enters the lower header 4 from the upper header without heat exchange. At this time, there may be more lubricating oil at the bottom of the liquid distribution pipe 6, so an oil return hole 11 is provided on the horizontal section where the inlet and outlet pipe 5 is located inside the lower header 4 to facilitate oil return.

Fig. 2 is an air-cooled heat exchanger for air-conditioning with a liquid-separating structure provided by the utility model with a main body arranged horizontally. The heat exchanger includes an upper header 1, parallel and horizontally arranged heat exchange tubes 2, a distributor 9 at the refrigerant inlet and fins 3 pierced or welded on the heat exchange tubes. A liquid separation structure is arranged on one side of the distributor 9, and the liquid separation structure is composed of a liquid separation pipe 6 arranged vertically and an inlet and outlet pipe 5 arranged at the bottom of the liquid separation pipe 6. The upper part of the liquid distribution pipe 6 communicates with the upper header through the communication pipe 8, and the lower part communicates with the distributor; the bottom of the liquid distribution pipe 6 is provided with an inlet and outlet pipe 5, and the inlet and outlet pipe 5 goes deep into the liquid distribution pipe. Sections consist of horizontal and vertical segments. When the heat exchanger is used as a condenser, a one-way valve 7 is arranged on the connecting pipe 8, and an oil return hole 10 is opened on the horizontal section inside the liquid separating pipe. The heat exchange tube 2 adopts a single tube with single-pass flow or multi-pass flow, or a micro-scale multi-channel tube with single-pass flow or multi-pass flow.

When the main part of the heat exchanger is arranged horizontally and used as an evaporator, the gas-liquid two-phase refrigerant first enters the liquid distribution pipe 6 through the inlet and outlet pipe 5 in the direction of the solid arrow in Figure 2, and the gravity makes the liquid distribution pipe 6 The middle liquid flows downwards, and the gas flows upwards, so that the upper part is gas and the lower part is liquid in the liquid-dispensing pipe 6 . The gas in the upper part directly enters the upper header 1 through the connecting pipe 8, and the liquid in the lower part enters the heat exchange tube 2 of the heat exchanger from the lower part of the liquid distribution pipe 6 through the distributor 9 and the pipe to exchange heat into gas and then enters the upper header 1 , is combined with the gas entering the upper header 1 through the communication pipe 8 in the upper header 1 and then discharged from the upper header 1 . Due to the existence of the connecting pipe 8, all the refrigerant entering the distributor 9 is a single-phase liquid, and the connecting pipes 11 from the distributor 9 to each heat exchange tube 2 maintain the same pipe diameter and length, keeping each pipe The flow resistance of the two channels is the same, so that good uniform liquid separation can be achieved, and the refrigerant gas in the liquid distribution pipe 6 is prevented from entering the heat exchange tube 2 to waste the heat exchange area of the evaporator, thereby solving the problem of refrigerant flow in various pipes in the evaporator The problem of unevenness makes the heat exchange area be effectively used and improves the heat exchange effect.

When the main part of the heat exchanger is arranged horizontally and used as a condenser, the high-temperature and high-pressure gas from the compressor first enters the upper header 1 in the direction reversed by the dotted arrow in Fig. After the heat is released in the heat exchange tube 2, it becomes a liquid, and the refrigerant liquid of each path enters the distributor 9 through the heat exchange tube 2 and the connecting pipe 11, and finally is discharged from the distributor 9 through the inlet pipe 5 connected with the liquid distribution pipe 6 in the reverse direction. Heater (dotted arrow in Figure 2). A one-way valve 7 is arranged on the connecting pipe 8, which only allows the refrigerant gas to flow from the liquid distribution pipe 6 to the upper header 1 through the connecting pipe 8, and does not allow the refrigerant gas to flow through the upper header 1. The flow of the pipe 8 to the liquid distribution pipe 6 avoids the short circuit phenomenon that the refrigerant gas directly enters the liquid distribution pipe 6 from the upper header 1 without heat exchange. At this time, after the condensation is completed, there may be more lubricating oil at the bottom in the liquid pipe, so an oil return hole 11 is provided on the horizontal section where the inlet and outlet pipe 5 is located inside the liquid pipe 6 to facilitate oil return ( image 3).

This solution can also be used in conventional finned tube air conditioner heat exchangers in which heat exchange tubes are arranged horizontally.

The utility model can be used not only in various heat pump air conditioners, but also in other occasions requiring air-cooled heat exchangers.

Claims (9)

1. An air-cooled heat exchanger for air-conditioning with liquid separation structure, the heat exchanger includes an upper header (1), a lower header (4), parallel and vertically arranged between the upper and lower headers The heat exchange tube (2), the fin (3) worn or welded on the heat exchange tube, is characterized in that: a liquid separation structure is arranged on one side of the heat exchanger, and the liquid separation structure is arranged vertically A liquid distribution pipe (6) and an inlet and outlet pipe (5) arranged at the bottom of the liquid distribution pipe, the upper part of the liquid distribution pipe communicates with the upper header through a communication pipe (8), and the lower part communicates with the lower header The pipe is connected; the part of the inlet and outlet pipe (5) that goes deep into the liquid distribution pipe is composed of a horizontal section and a vertical section. 2. According to claim 1, the air-cooled heat exchanger for air-conditioning with its own liquid separation structure is characterized in that: when the heat exchanger is used as an evaporator, the heat exchange tube (2) goes deep into the lower bottom of header (4). 3. According to claim 1, the air-cooled heat exchanger for air-conditioning with its own liquid separation structure is characterized in that: when the heat exchanger is used as a condenser, a one-way valve ( 7), and an oil return hole (10) is opened on the horizontal section inside the liquid pipe. 4. The air-cooled heat exchanger for air-conditioning with liquid separation structure according to claim 1, 2 or 3, characterized in that: said heat exchange tube adopts a single tube with single-pass flow or multi-pass flow. 5. According to claim 1, 2 or 3, the air-cooled heat exchanger for air-conditioning with its own liquid separation structure is characterized in that: the heat exchange tube adopts a micro-scale multi-channel tube with one-way flow or multi-pass flow . 6. An air-cooled heat exchanger for air-conditioning with a liquid separation structure, the heat exchanger includes an upper header (1), parallel and horizontally arranged heat exchange tubes (2), and a distributor at the refrigerant inlet ( 9) and the ribs (3) worn or welded on the heat exchange tubes, characterized in that: a liquid distribution pipe (6) is vertically arranged on one side of the distributor, and the upper part of the liquid distribution pipe passes through the communication pipe ( 8) It communicates with the upper header, and the lower part communicates with the distributor; the bottom of the liquid distribution pipe is provided with an inlet and outlet pipe (5), and the part of the inlet and outlet pipe (5) that penetrates into the liquid distribution pipe is composed of a horizontal section and a vertical section. segment composition. 7. According to the air-cooled heat exchanger of air-conditioning with liquid separation structure according to claim 6, it is characterized in that: when the heat exchanger is used as a condenser, a one-way valve ( 7), and an oil return hole (10) is opened on the horizontal section inside the liquid pipe. 8. The air-cooled heat exchanger for air-conditioning with its own liquid separation structure according to claim 6 or 7, characterized in that: the heat exchange tube adopts a single tube with single-pass flow or multi-pass flow. 9. The air-cooled heat exchanger for air-conditioning with its own liquid separation structure according to claim 6 or 7, characterized in that: said heat exchange tubes are micro-scale multi-channel tubes with single-pass flow or multi-pass flow.

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